US3777047A - Spacer damper - Google Patents

Spacer damper Download PDF

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Publication number
US3777047A
US3777047A US00353650A US3777047DA US3777047A US 3777047 A US3777047 A US 3777047A US 00353650 A US00353650 A US 00353650A US 3777047D A US3777047D A US 3777047DA US 3777047 A US3777047 A US 3777047A
Authority
US
United States
Prior art keywords
frame
conductor
clamp
clamps
cable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00353650A
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English (en)
Inventor
C Rawlins
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Howmet Aerospace Inc
Original Assignee
Aluminum Company of America
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aluminum Company of America filed Critical Aluminum Company of America
Application granted granted Critical
Publication of US3777047A publication Critical patent/US3777047A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G7/00—Overhead installations of electric lines or cables
    • H02G7/12—Devices for maintaining distance between parallel conductors, e.g. spacer
    • H02G7/125—Damping spacers

Definitions

  • the present invention relates generally to damping spacers for overhead, parallel electrical conductors, sometimes termed a conductor bundle, in which each conductor is called a subconductor, and more particularly to a spacer damper having improved damping characteristics over the spacer damper disclosed in U. S. Walker et al. US. Pat. 3,443,0l9.
  • electrical conductor clamps are connected to the extremities of a generally H or X-shaped spacer frame by essentially straight, resilient cables made of resilient wire strands.
  • Each clamp has an integrally formed, elongated sleeve surrounding its associated wire cable, which sleeve extends rearwardly from the clamp into an elongated cavity or socket provided in the spacer frame to accommodate the sleeve and cable.
  • the axes of the wire cable and sleeve are in line with and thus extend generally through the axis of the groove in the clamp for receiving an electrical conductor.
  • the conductor clamp pivots on the axis of the wire cable to flex the same and thereby provide friction between the wire strands, the friction providing damping action through heat dissipation.
  • damping cables in the Walker et a]. patent are protected against excessive compression forces acting thereon by the sleeve, i.e., with forces directed inwardly therealong the sleeve abuts against the frame at the end of the cavity accommodating the sleeve and resilient cable.
  • the damping cables of the patent are not, however, protected from high tensile forces and stresses imposed thereon since such forces act directly upon the damping cable without means for restraining the same. With sufficient force and frequency of such tensile stressing the cable can eventually weaken and finally break, leaving the conductor originally secured by the broken cable free to move against the other parallel conductors.
  • the present invention provides a damping spacer in which the damping cables function to dampen both horizontal and vertical movements and oscillations of clamped conductors while simultaneously protecting the damping cables from both tensile and-compression forces imposed thereon by the clamped conductors. Briefly, this is accomplished by resiliently connecting each conductor clamp to a spacer frame by a multistrand wire cable extending in a direction generally perpendicular to the axis of the clamp so that the conductor held by the clamp is not in line with the axis of the wire cable. Further, each clamp is mechanically but loosely coupled or connected to the frame to allow each clamp free movement with respect to the frame within the limits of the loose couple.
  • the multistrand cable connecting the conductor clamp to the frame is free to flex, and thereby provide damping action via interstrand friction, in the direction that accommodates the particular conductor movement, the only restraint imposed on cable movement being that of the means loosely coupling the clamp to the frame.
  • the conductor clamps move to engage the frame to thus transfer such forces directly to the frame.
  • the frame receives excessive compressive and tensile forces rather than the cables, thereby protectingthe cables from such forces and thus increasing the life of the cables over prior constructions using damping cables.
  • the frame has a generally circular or closed loop configuration, the degree of freedom of each clamp and conductor with respect to the other is enhanced since the clamps and damping cables will be located on the frame at various angles with respect to each other.
  • a damping spacer 10 of the invention in which a frame 12 supports a plurality of clamps 14 between two parallel, spaced apart frame plates 12A and 128, the plates being spaced apart a distance to allow free movement of the clamps.
  • the plates are secured together by suitable fastening means, such as the nuts and bolts shown in the drawing and generally indicated by numerals 12C and 12D, the bolts extending through and between the plates 12A and 128, In the drawing, a portion of plate 128 is made visible by cutting away a portion of plate 12A.
  • the plurality of clamps 14 are adapted to clamp, in opposed, conductor receiving grooves 15 thereof, a corresponding plurality of parallel conductors 16, shown in cross section.
  • a corresponding plurality of parallel conductors 16 shown in cross section.
  • three conductor clamps in a three subconductor bundle arrangement are spaced by frame 12, frame 12 being depicted in the figure of the drawing as a closed loop, unitary structure having an outwardly rounded though somewhat triangular configuration.
  • the invention is not limited to such a configuration and number of clamps, it being applicable, for example to damping and spacing two, four or more parallel subconductors.
  • Each clamp 14 is resiliently attached to the frame 12 by an essentially straight, multistrand wire cable 18 lying between the frame plates 12A and 12B.
  • one of the wire cables and conductor clamp is made entirely visible by the above-mentioned cutaway portion of the frame plate facing the viewer.
  • the wire cable is shown disposed at a substantially right angle to the axis of an arm portion 20 of the clamp, which portion also lies between the plates of the frame.
  • each cable 18 may be secured within a The other end of the cable 18 may be secured to the frame 12, and between the frame plates 12A and 128 as shown in the figure, by two blocks 22 fastened to the frame by the bolts 12C, the blocks having cable engaging surfaces that tighten on the cable end when the bolts are tightened on the frame.
  • each cable 18 are made of resilient material, galvanized steel for example, and are wound together in a helical lay as shown in the drawing.
  • the diameter, lay and strength of the resilient strands are such that with flexing of the cable caused by aeolian or horizontal oscillation of its associated conductor interwire friction occurs sufficient to dissipate, in the form of heat, the energy of such oscillations without fatigue and failure of the strands, and thus function to damp the oscillations of the conductor.
  • each wire cable 18 and clamp arm 20 are angularly disposed with respect to each other such that,
  • each conductor 16 and conductor receiving groove 15 of each clamp are offset from and eccentrically located with respect to the axis of each cable 18.
  • the conductor clamps 14 are mechanically connected or coupled to the frame by the shanks of the bolts 12D extending between the frame plates 12A and 12B, and respectively through openings or slots 26 provided in the respective clamps.
  • each bolt 12D is substantially smaller than the smallest dimension of the openings 26 such that the mechanical connection afforded by each bolt is loose, the looseness of the connection providing a freedom of movement of the associated clamp 14 and conductor 16 with respect to the frame 12.
  • the opening 26 in each clamp is located in an enlarged portion 28 of the clamp at a location between the cable connection 21 and the conductor receiving groove 15 of the clamp.
  • Such a clamp portion permits the opening 26 to be elongated along a line forming generally an acute angle with the axis of its associated resilient cable 18. Further, the openings may be slightly curved along its length dimension, as shown in the drawing.
  • a plurality of the spacers of the invention are clamped to parallel conductors, such as 16, at spaced apart intervals along the length of the conductors between their supporting poles or towers.
  • the frames 12 of the spacer-dampers, with the clamps 14, function to maintain the conductors in spaced relationship with the occurrence of any relative movements of the conductors.
  • the clamps 14 will tend to move with respect to the frame, between the frame plates, and in a plane parallel thereto. Because of the eccentricity of the cable and conductor axes, and since each damper cable 18 is an elongated, flexible member, it may flex in a manner to accommodate motions of the conductor clamps in any direction in the plane of the spacer frame 12.
  • the clamp end of the cable 18 may be displaced in the plane of the spacer and perpendicular to the cable axis, causing cable 18 to bow into an arc, allowing an associated displacement of conductor clamp 14.
  • the clamp end of cable 18 may be rotated without lateral displacement about an axis perpendicular to the plane of the spacer frame 12. This latter, rotational displacement also results in a translational displacement of the conductor clamp due to the eccentricity of conductor clamp from the cable 18.
  • the conductor clamp displacements associated with displacement and rotation respectively of the clamp end of cable 18 are in different directions in the plane of spacer frame 12. Thus a combination of cable end displacement and rotation may always be found to accommodate a displacement of the conductor clamp 14 in any direction in the plane of the spacer frame 12.
  • a damping spacer for parallel, overhead conductors comprising a frame, a plurality of spaced conductor clamps each having a groove for receiving one of said overhead conductors, and an arm portion connected to said frame, a flexible wire cable resiliently connecting each of said clamp arm portions to said frame at spaced locations thereon, the clamp arm portions and resilient cables providing a structure in which the axis of the conductor receiving groove of each conductor clamp is displaced from that of the wire cable associated therewith, and means loosely coupling together said frame and clamps to limit the movement of said wire cables and clamps with respect to the frame.
  • each of the clamps has an opening therein of a predetermined size and configuration, and means fixed to the frame extending through each of said openings, each of said means having a cross section smaller than the smallest dimension of said openings.

Landscapes

  • Suspension Of Electric Lines Or Cables (AREA)
US00353650A 1973-04-23 1973-04-23 Spacer damper Expired - Lifetime US3777047A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US35365073A 1973-04-23 1973-04-23

Publications (1)

Publication Number Publication Date
US3777047A true US3777047A (en) 1973-12-04

Family

ID=23389995

Family Applications (1)

Application Number Title Priority Date Filing Date
US00353650A Expired - Lifetime US3777047A (en) 1973-04-23 1973-04-23 Spacer damper

Country Status (9)

Country Link
US (1) US3777047A (pt)
JP (1) JPS5012589A (pt)
AR (1) AR198465A1 (pt)
BR (1) BR7402869D0 (pt)
DE (1) DE2413928C3 (pt)
FR (1) FR2226768B1 (pt)
GB (1) GB1419746A (pt)
IT (1) IT1011169B (pt)
ZA (1) ZA741471B (pt)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3925595A (en) * 1975-02-24 1975-12-09 Aluminum Co Of America Frameless damping spacer
US3939300A (en) * 1975-02-24 1976-02-17 Aluminum Company Of America Frameless damping spacer with close coil spring
US4012581A (en) * 1976-03-05 1977-03-15 Aluminum Company Of America Frame-type damping spacer
CN105633892A (zh) * 2014-11-06 2016-06-01 国家电网公司 一种阻尼调整型防次档距振荡间隔棒
CN107026420A (zh) * 2016-02-02 2017-08-08 中国电力科学研究院 一种弹阻型的半分裂数间隔导线线夹间隔棒

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5646496Y2 (pt) * 1977-12-06 1981-10-30
DE102016202789A1 (de) * 2016-02-23 2017-09-07 Richard Bergner Elektroarmaturen Gmbh & Co. Kg Feldabstandhalter

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3443019A (en) * 1968-06-20 1969-05-06 Lacol Ind Ltd Spacer damper
US3582983A (en) * 1969-02-22 1971-06-01 Salvi & Co Spa A Elastic spacer for bundles of conductors

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5328813Y2 (pt) * 1972-06-01 1978-07-20

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3443019A (en) * 1968-06-20 1969-05-06 Lacol Ind Ltd Spacer damper
US3582983A (en) * 1969-02-22 1971-06-01 Salvi & Co Spa A Elastic spacer for bundles of conductors

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3925595A (en) * 1975-02-24 1975-12-09 Aluminum Co Of America Frameless damping spacer
US3939300A (en) * 1975-02-24 1976-02-17 Aluminum Company Of America Frameless damping spacer with close coil spring
US4012581A (en) * 1976-03-05 1977-03-15 Aluminum Company Of America Frame-type damping spacer
CN105633892A (zh) * 2014-11-06 2016-06-01 国家电网公司 一种阻尼调整型防次档距振荡间隔棒
CN107026420A (zh) * 2016-02-02 2017-08-08 中国电力科学研究院 一种弹阻型的半分裂数间隔导线线夹间隔棒
CN107026420B (zh) * 2016-02-02 2020-07-24 中国电力科学研究院 一种弹阻型的半分裂数间隔导线线夹间隔棒

Also Published As

Publication number Publication date
JPS5012589A (pt) 1975-02-08
DE2413928A1 (de) 1974-11-07
FR2226768B1 (pt) 1977-05-20
ZA741471B (en) 1975-02-26
GB1419746A (en) 1975-12-31
BR7402869D0 (pt) 1974-11-19
FR2226768A1 (pt) 1974-11-15
DE2413928C3 (de) 1980-06-19
IT1011169B (it) 1977-01-20
DE2413928B2 (de) 1979-08-23
AR198465A1 (es) 1974-06-21

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